Carbureter.



R. C. NORMAN, Jn. CARBURETE'H.

APPLICATION FILED JULY 6. I915.

1,21 6,1 5.. Patented Feb. 13, 1917.

INF mums PETERS m. Pnovo-Llruu, wAsmNcmN. u c.

RICHARD CARR NORMAN, JR, OF GEAYTON, MARYLAND.

CARBUBETEBJ.

sgec ification of Letters Patent.

' Patented Feb. 1 .3, 1917.

Application filed July 6, 1915. Serial an. same.

To all whom it may concern:

Be it known that I, RICHARD CARR NOR- MAN, Jr., a citizen of the UnitedStates, re-

siding at Grayton, in the county of Charles and State of Maryland, haveinvented certain new and useful Improvements in Carfication.

Gasolene or internal combustion engines, utilizing volatile liquid fuelmixed with air,

generally embody a carburetor through expands and drives the pistontherein. It

is necessary, by reason of changes in atmospheric and load conditions,that the pro portions of air and vaporized fuel be varied in order thatthe best results may be attained in securing a maximum amount of power,

from a given quantity of fuel and to obviate the fouling of the engineby deposition of carbon.

The present invention provides a carbureter which admits of theproportions of air and vaporized fuel being readily controlled either byhand or automatically, or both, and which is simple in construction andembodies a few number of parts, thereby being adapted for motor vehiclebecause of its,

flexibility and the ease with which access may be had to every part forany purpose whatsoever.

The invention consists of a carburetor having an air tube into which thegaseous mixture is injected and attenuated by fur ther admixturetherewith of air in regulated quantity as occasion may require.

The invention further consists of a car bureter having avalve-controlled fuel inlet, the valve having a float adjustablyconnected therewith and formed with a duct through which the gaseousmixture passes to the air tube, andth'e body or bowl of the carburetorhaving air inlets through which the air is drawnby the suction of theengine and caused to pass through the'duct of the; valve along with acertain proportion of the volatile'liquid fuel, the mixture being dolivered into the air tube in which thorough carbureting is effected.

With these and other objects in view, which will readily appear as thenature of the invention is better understood, the same consists in theimproved construction and bureters, of which the following is aspecinovel arrangement and combination of parts which will behereinafter fully described and particularly claimed.

In the accompanying drawing has been illustrated a simple and preferredform of the invention, it being, however, understood that no limitationis necessarily made to the precise structural details therein exhibited,but that changes, alterations and modifications within the scope of theinvention as claimed may be resorted to when desired.

The drawing is a vertical central section of a carburetor embodying theinvention.

Corresponding and like parts are referred to in the followingdescription and indicated in both views of the drawings by the samereference characters.

The carburetor comprises a bowl, or hollow body 1, which may be of anymaterial although glass is preferred as it enables the interior to beobserved at all times, thereby avoiding the necessity for removing thecover to inspect the float, valve and other parts. A cover 2 closes theupper end of the through which the upper end of a valve 5' passes. Anair tube 6 is preferably formed with the cover 2 as a part thereof,although said air tube may be connected with the cover 2 in any mannerso as to be supported thereby. The air tube 6 is formed in its lowerportion with a depression 7 which is in line with the raised portion 8of the cover 2. The wall separating the depression 7 from the raisedportion 8 is common to the tube 6 and cover 2 and has the opening 4.formed therein. One end of the air tube 6 is adapted to be connected inany manner to the engine to be supplied with a gaseous mixture. Theopposite end of the air tube 6 is provided with a valve controlled airinlet sible in the carbureting of the air.

the tube 6 preliminary to the entrance of the mixture into the cylinderof the engine. The valve 11 may be operated in any manner eithermanually or automatically.

A thimble 13 is fitted to the lower portion of the bowl or carbureterbody 1 and is formed with an inner valve seat 14: against which the head15 of the valve 5 is adapted to close. Nuts 16 and 17 are threaded uponthe thimble 13 above and below the bottom portion of the part 1 which isclamped therebetween. Gaskets 18 are interposed between the nuts 16 and17 and the bottom portion of the part 1 clamped between such nuts so asto secure a close joint and prevent injury to the body 1 when the sameis formed of glass or vitreous material. The feed pipe 19 is connectedto the lower end of the thimble 13 by means of a coupling 20.

A float 21 is mounted upon the valve 5 and is movable therewith. Thefloat 21 may be of any formation so as to be buoyed by the volatilehydro-carbon contained in the part 1. It is preferred to construct thefloat 21 of cork and to fit the same with a bushing 22 which is threadedto make screw thread engagement with the valve 5 so that the float maybe adjusted to the proper position in order to obtain the best resultspos A depression 23 is formed in the upper side of the fioat'2l at acentral point and this de pression constitutes a well for receiving aportion of the volatile liquid fuel which passes into it throughsuitable passages 21 formed through the float. A bead, or flange, 24-extends inward from the inner wall of the bowl or body 1 and underlapsthe outer portion of the float 21 and forms a support for the float whenthe level of the fuel is insuliicient to buoy the float. The float has alimited vertical movement between the cover 2 and the inner stop orshoulder formed by means of the head, or flange, 24.

A duct 25 is formed in the upper portion of the valve 5 and opens at itslower end through a side of the valve. The lower end of the duct 25terminates in a plurality of branches 26 which curve downwardly andoutwardly. The receiving ends of the branches 26 are in the same planewhich preferably corresponds with the level of the volatile liquid fuelcontained in the bowl or body 1. The upper end of the valve 5 is madetapering and theduct 25 formed centrally in the valve extends throughthe apex thereof. The valve 5 is free to rise and fall with the float 21according to the change of level of the fuel in the part 1. Normally thehead 15 of the valve 5 closes against the seat 14:, thereby shutting olfthe supply of liquid fuel to the bowl or body 1 of the carbureter. Whenthe level of the fuel lowers in the part 1 the float 21 descends and thehead 15 of the valve moves away from the seat 14,

well 23 with the result that a certain proportion of the liquid fuel iscarried into the branches 26 along with the air thence upwardly throughthe duct 25 and into the tube 6. The jet issuing from the duct 25consists of air and particles of the liquid fuel and such jet expandswith the result that the liquid fuel is vaporized and mixed with theair, the resultant gaseous mixture being further attenuated, ifnecessary, by means of air entering the auxiliary air inlet representedby the openings 10. The auxiliary air travels across the jet issuingfrom the duct 25 and assists materially in vaporizing the particles ofthe liquid fuel contained in the jet and in causing the production of ahomogeneous gaseous mixture.

The exact level of the gasolene in the chamber 23 with respect to thebranch openings 26 of the passage 25'must be determined with regard tothe engine with which the carbureter is employed. Some engines require ahigher percentage of gasolene in the explosive mixture than others andthe level in this chamber willbe varied to suit circumstances by properadjustment of the float upon the valve stem. Generally speaking, thelevel will be somewhere across the mouths of the openings 26,, beingslightly higher or lower according to the quantity of gasolenenecessary.

From the foregoing, taken in connection with the accompanying drawings,it will be understood that the invention provides a carbureterparticularly adapted for use in connection with gasolene motors ofautomobiles because of the flexibility, of the carbureter, the fewnessof the parts embodied in its organization and the facility with whichsuch parts are accessible for adjustment, replacement or any otherdesired purpose.

Having thus described the invention, what is claimed as new is 1. In acarbureter, a body having a fuel inlet, a valve for closing the fuelinlet and having a duct formed in its upper portion and having the lowerend of the duct opening laterally through a side of the valve, and afloat mounted upon the valve below the receiving end of the duct formedtherein.

2. In a carbureter, a body having a fuel inlet, a valve for closing thefuel inlet and having a duct formed in its upper portion and having thelower end of the duct opening laterally through a side of the valve, anda float mounted upon the valve below the receiving end of the ductformed therein, said float having a depression in its upper side withits bottom in a lower plane than the receiving end of the duct.

3. In a carburetor, a body having a fuel inlet, a valve for closing thefuel inlet having a duct in its upper portion terminating at its lowerend in a plurality of branches which extend downward and outward throughthe sides of the valve, and a float mounted upon the valve and having adepression in its upper side surrounding the valve and receiving thelower end of the branches of the said duct.

4-. in a carburetor, a body having a fuel inlet, a valve for controllingthe fuel inlet and formed in its upper portion with a duct terminatingat its lower end in a plurality of outwardly opening branches, a floatmounted upon the valve and having a depression in its upper sidereceiving the lower ends of the branches of the duct, and means forsupplying jets of air to the upper portion of the carbureter body.

5. In a carburetor, a body having a fuel inlet in its lower portion, anda plurality of air inlets in its upper portion, a valve for controllingthe fuel inlet and provided with a duct in its upper portion terminatingat its lower end in a plurality of outwardly opening branches, and afloat mounted upon the valve and having a depression in its upper sidereceiving the lower ends of the branches of the said duct. 7

6. In a carburetor, a body having fuel and air inlets, a valve forclosing the fuel inlet and having a duct in its upper portion for thepassage of a mixture of air and fuel, a float mounted upon the valve, atube receiving the jet of air and fuel from the said valve, and meansfor'supplying air in regulated quantity to the said tube.

7. In a carburetor, a body having fuel and air inlets, a tube havingconnection with the body and provided with an auxiliary air inlet, avalve for closing the fuel inlet and extending into the said tube andprovided in its upper portion with a duct which opens at its lower endthrough a side of the valve, and a float mounted upon the valve andmovable therewith.

8. In a carburetor, a body having a fuel inlet and having its upperportion raised and provided with a plurality of air inlets, a tubehaving connection with the carburetor body and provided with anauxiliary air inlet, a valve for closing the fuel inlet and extendingthrough the raised portion of the carbureter and entering the said tubeand having a duct in its upper portion which opens at its lower endthrough a side of the valve, and a float mounted upon the valve andmovable therewith.

9. In a carburetor, a body provided with a fuel inlet and having itsupper portion centrally raised and formed with a plurality of downwardlyand inwardly converged air inlets, a tube having connection with thecarbureter body and provided with an auxiliary air inlet, a valve forclosing the fuel inlet and having its upper portion extending into thesaid tube and formed with a duct which terminates at its lower end in aplurality of downwardly and outwardly opening branches, and a floatmounted upon the valve and having a recess in its upper side into whichthe lower ends of the branches of the said duct open.

10. In a carbureter, a body having a fuel inlet in its bottom, a coverclosing the upper end of the body and formed with a central raisedportion having a plurality of down wardly converged air inlets, a tubeprovided with an auxiliary air inlet mounted upon the cover of thecarburetor body and having a depression opposite and in line with theraised portion of the cover, a valve for closing the fuel inlet andextending into the said tube and passing through the depression thereofand the raised portion of the cover, said valve having a duct in itsupper portion which terminates at its lower end in a plurality ofdownwardly and outwardly opening branches, and a float mounted upon thevalve and having a depression in its upper side receiving the lower endsof the branches of the said ducts.

In testimony whereof I afiix my signature.

RICHARD CARR NORMAN, n. 1 8-] Copies oi this patent may be obtained forfive cents each, by addressing the Commissioner of Patents, Washington,D. C.

